Hunan ChangdeHuayanxi Provincial Nature Conservation Analysis And Conservation Of Plant Diversity

In recent years,with China’s emphasis on ecological environment protection,the construction of ecological civilization has been incorporated into the long-term goal of socialist construction,and the establishment of a natural protection system with national parks as the core has been proposed.Huayanxi Provincial Nature Reserve is an important part of the natural protected area system in Changde City.Understanding the basic data of Huayanxi Provincial Nature Reserve,especially the characteristics of plant diversity,is of great significance to the construction of natural protected area system in Changde City.Therefore,this paper takes Huayanxi Provincial Nature Reserve as the research object,focusing on the plant resources of Huayanxi Provincial Nature Reserve.Through the field investigation of plant resources in this area,the plant species composition,flora distribution characteristics,vegetation community types and quantitative characteristics in nature reserve were analyzed by using plant taxonomy,plant geography and plant protection methods.The distribution characteristics and threatened factors of key protected plants and ancient and famous trees in nature reserves were analyzed,and suggestions from species protection to habitat protection were put forward.The main research results are as follows:(1)Huayanxi Provincial Nature Reserve is rich in vascular plants.Vascular plants in nature reserves belong to 175 families,663 genera and 1225 species.Among them,pteridophytes 32 families,49 genera,110 species,gymnosperms 6 families,12 genera,16 species,angiosperms 137 families,602 genera,1099 species.59.34%of vascular plants in Wuyunjie National Nature Reserve and 43.23%of vascular plants in Hupingshan National Nature Reserve.(2)The characteristics of dominant families and genera are obvious.The dominant families of ferns are 5 families,17 genera and 62 species,accounting for 34.69%and 56.36%of the total genera and species;the dominant genera of ferns are 18 genera,a total of 45 species,accounting for 36.62%and 40.91%of the total genera and species.The dominant families of seed plants are 16 families,a total of 277 genera and 525 species,accounting for 43.21%and 47.77%of the total genera and species.The dominant genera of seed plants are 35 genera,accounting for 5.70%and 20.36%of the total genera and species.(3)Flora composition is complex and diverse.Pteridaceae,genera can be attributed to 6 distribution types and 10 distribution types.The families of seed plants belong to 13 distribution types,and the genera of seed plants belong to 14 distribution types and 19 variants.It can be seen that Huayanxi Provincial Nature Reserve contains 14 of the 15 geographical distribution types of plant genera in China.(4)Floristic characteristics are obvious.Flora of Huayanxi Provincial Nature Reserve has obvious temperate and tropical components.Tropical distribution of 285 genera,temperate distribution of 295 genera,accounting for 46.41%and 48.05%of the total number of vascular plants in the reserve.Tropical and temperate components are close,reflecting the transition trend of flora from tropical components to temperate components in Huayanxi Provincial Nature Reserve.(5)There are many relic species and protected species.Magnoliaceae,octagonace ae,Lameiaceae,Eucommiaceae,Berberaceae,Mutongaceae and Celastraceae,Ginkgo,Celastraceae,Jujube,Berleaceae,Cyclocaryapaliurus,Fragrant fruit trees are distribu ted in the area,which shows that the flora of this area is ancient.In addition,there wer e 3 species of national grade Ⅰ key protected plants,19 species of national grade Ⅱ key protected plants and 8 species of local key protected plants in Hunan Province.There are 2 ancient trees of national grade Ⅰ,14 ancient trees of national grade Ⅱ and 76 anci ent trees of national grade Ⅲ.(6)Various vegetation types.Huayanxi Provincial Nature Reserve belongs to the northern subtropical evergreen broad-leaved forest in the vegetation regionalization.The abundant rainfall and good natural conditions create suitable habitats for the growth of forest vegetation.The main vegetation groups can be divided into six types:evergreen broad-leaved forest,evergreen deciduous broad-leaved mixed forest,deciduous broad-leaved forest,coniferous forest,bamboo forest and shrub,including 14 groups and 21 groups.(7)Plant number characteristics and species diversity index changed gently.The important values of tree layer,shrub layer and herb layer changed gently in Huayanxi Provincial Nature Reserve.The important value of the first eight arbor plants was 61.92,and the important value of arbor plants ranged from 0.15 to 37.86.The sum of the important values of the first eight shrub plants was 35.20,and the important values ranged from 0.18 to 8.13.The sum of the important values of the first eight herbaceous plants was 48.41,and the important values ranged from 0.16 to 12.38.Shannon-Wiener index was between 3.17 and 4.08,Simpson index was between 0.864 and 0.974,and Pielou index was between 0.680 and 0.892.(8)For many rare and endangered plants and ancient and famous trees in HuayanxiProvincial Nature Reserve,from the perspective of plant species protection,to the protection of plant habitat,to the protection of the whole nature reserve,reasonable protection suggestions are put forward to maintain the stability of complex plant communities.